C++ Aggregation (HAS-A Relationship)

In C++, aggregation is a process in which one class defines another class as any entity reference. It is another way to reuse the class. It is a form of association that represents HAS-A relationship.

C++ Aggregation Example

Let's see an example of aggregation where Employee class has the reference of Address class as data member. In such way, it can reuse the members of Address class.

#include <iostream>
using namespace std;
class Address {
    public:
   string addressLine, city, state;  
     Address(string addressLine, string city, string state)  
    {  
        this->addressLine = addressLine;  
        this->city = city;  
        this->state = state;  
    }  
};
class Employee  
    {  
        private:
        Address* address;  //Employee HAS-A Address 
        public:
        int id;  
        string name;  
        Employee(int id, string name, Address* address)  
       {  
           this->id = id;  
           this->name = name;  
           this->address = address;  
       }  
     void display()  
       {  
           cout<<id <<" "<<name<< " "<<   
             address->addressLine<< " "<< address->city<< " "<<address->state<<endl;  
       }  
   }; 
int main(void) {
    Address a1= Address("C-146, Sec-15","Noida","UP");  
    Employee e1 = Employee(101,"Nakul",&a1);  
            e1.display(); 
   return 0;
}

Output:

101 Nakul C-146, Sec-15 Noida UP

Next TopicC++ Polymorphism

← prev next →

For Videos Join Our Youtube Channel: Join Now

Feedback

Send your Feedback to [email protected]

Help Others, Please Share

Learn Latest Tutorials

Splunk

SPSS

Swagger

Transact-SQL

Tumblr

ReactJS

Regex

Reinforcement Learning

R Programming

RxJS

React Native

Python Design Patterns

Python Pillow

Python Turtle

Keras

Preparation

Aptitude

Reasoning

Verbal Ability

Interview Questions

Company Questions

Trending Technologies

Artificial Intelligence

AWS

Selenium

Cloud Computing

Hadoop

ReactJS

Data Science

Angular 7

Blockchain

Git

Machine Learning

DevOps

B.Tech / MCA

DBMS

Data Structures

DAA

Operating System

Computer Network

Compiler Design

Computer Organization

Discrete Mathematics

Ethical Hacking

Computer Graphics

Software Engineering

Web Technology

Cyber Security

Automata

C Programming

C++

Java

.Net

Python

Programs

Control System

Data Mining

Data Warehouse

Javatpoint Services

JavaTpoint offers too many high quality services. Mail us on h[email protected], to get more information about given services.

Website Designing
Website Development
Java Development
PHP Development
WordPress
Graphic Designing
Logo
Digital Marketing
On Page and Off Page SEO
PPC
Content Development
Corporate Training
Classroom and Online Training
Data Entry

Training For College Campus

JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected].
Duration: 1 week to 2 week

^{Like/Subscribe us for latest updates or newsletter}

C++ Tutorial

C++ Control Statement

C++ Functions

C++ Arrays

C++ Pointers

C++ Object Class

C++ Inheritance

C++ Polymorphism

C++ Abstraction

C++ Namespaces

C++ Strings

C++ Exceptions

C++ Templates

Signal Handling

C++ File & Stream

C++ Misc

C++ STL Tutorial

C++ Iterators

C++ Programs

MCQ

Interview Question